coilovers advice

[robotype]

thank you what you explained is quite clear for me. what I wanted to understand is this: there are two springs with the exact same stiffness, the only difference between the two is one is twice as long as the other. now, if I use the first on the right wheel and the other on the left...will they behave the same? I don't think so...in my immagination the longer spring will drop more than the short one because with the same weigth if the short one shrinks 1 cm the long one will shrink 2 cm...

anyway long story short, if I want 4kg springs for the front I should not worry about the lenght because if it's 4kg that's all I want to know. then I can adjust it with the nut rings on the strut thread. correct?